From two-inch beach mice to 24-metre blue whales, North America is home to the most diverse and charismatic marine life on the planet. Presenter Lizzie Daly embarks on an epic road trip from the frozen shores of northern Alaska to the tropical reefs of Panama to explore the challenges and opportunities facing marine life.

Making her way around the coast, exploring some of the richest and most isolated seas in the world, Lizzie meets a host of incredible creatures and the dedicated people protecting them. Consulting marine specialists and indigenous experts alike, Lizzie gets an extraordinary insight into the unique ecology of North America as she discovers what makes these waters so special.